1. (x+3)²=4 2. x²-3x>-2 3. x ²+2x-1≥2

1. (x+3)²=4 x²+6x+9=4 x²+6x+5=0 Δ=36-20=16 √Δ=4 x₁=-6-4/2=-10/2=-5 x₂=-6+4/2=-2/2=-1 2. x²-3x>-2 x²-3x-2>0 Δ=9+8=17 √Δ=√17 x₁=3+√17/2 x₂=3-√17/2 3. x ²+2x-1≥2 x²+2x-1≥0 Δ=4+4=8 √Δ=√8 x₁=-2-√8/2 x₂=-2+√8/2 Δ - delta